The study focuses on understanding the users' attributes that contribute to the usage behavior in the development of Management Information Systems (MIS). Previous Information Systems (IS) literature have suggested the users' role in MIS success. Until recently, IS researches focus on the use of behavioral models to explain for users' behavior in the adoption of MIS. The research design of this study is to use the Decomposed Theory of Planned Behavior (DTPB) (Taylor and Todd, 1995) as a basis to assess the relative importance of beliefs structures that affect the behavioral intentions to MIS usage. The findings in this study is different from that obtained by Taylor and Todd, 1995. Among the beliefs structures, only attitudinal beliefs contributed to the positive behavioral intentions to MIS usage and the differences will be discussed. Finally, with reference to the significance of findings in the study, recommendations will be given to health care managers as to provide insights to make their strategic plans for development of MIS. Thus, managers are able to manage the development process more successfully.